Grounding attachment for pantograph engraving-machines.



No. 638,927. Patented Dec. l2, I899. J. HOPE & J. HOPE, JR. GROUNDINGATTACHMENT FOR PANTUGBAPH ENGBAVING MACHINES.

(Application filed June 13, 1898.)

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No. 638,927. Patented Dec. l2, I899. J. HOPE & J. HOPE, In.

GBDUNDI NG ATTACHMENT FOB PANTOGRAPH EHGHAVING MACHINES.

(Application filed June 13, 1898.) (No Model.) 3 Sheets-Sheet 2.

Patented Dec. [2, I899.

.1. HOPE & .1. HOPE, 1R. GROUNDING ATTACHMENT FUR PANTOGRAPH ENGRAVINGMACHINES.

(Application filed June 13, 1898.)

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NIT-ED PATENT Prion.

JOHN HOPE AND JOHN HOPE, JR., OF

ORS, TO THE JOHN HOPE GROUNDING ATTACHMENT FOR PANTOGRAPHENGRAVING-MACHINES.

SPECIFICATION forming part of Letters Patent No. 638,927, dated December12, 1899.

Application filed June 18, 1898- To ail whom it may concern.- Be itknown that we, JOHN HOPE and .IOH HOPE, J r., of Providence, in thecounty of Providence and State of Rhode Island, have invented a new anduseful Improvement in Grounding Attachments for PantographEngraving-ll/Iaohines; and we herebydeclare that the following is afull, clear, and exact description of the same, reference being had tothe accompanying drawings, forming part of this specification.

This invention has reference to an attachment for pantographengravingmaohines in which the cylindrical surface of calico-printersrolls is engraved. In this class of engraving machines a series ofgravers are supported on carriages which are operated to move1ongitudinally parallel with the roll or cylinder to be engraved, whilethe said roll or cylinder is rotatably moved, so as to reproduce aseries of patterns. The carriages are controlled in their longitudinalmovement by What is termed the stylus-carriage and the roll by what isusually termed the stylus-frame. The movement of the stylus-frame istransverse to the roll or cylinder to be engraved, and the movement ofthe stylus-carriage is longitudinal to and parallel with the roll orcylinder. The stylus or tracer is pivotally secured to thestylus-carriage. In following the lines of a pattern the operator movesthe stylus carriage and the stylus frame and through them and theconnecting actuating mechanism moves the gravers longitudinally, whilealso partially rotating the roll or cylinder, thereby reproducing theusually enlarged pattern traced by the stylus on the roll or cylinder,generally on a reduced scale. When the outlines of the pattern have beenreproduced on the cylinder, the spaces inclosed by the outlines requireto be grounded-that is, filled with lines parallel to each other andusually oblique to the axis of the cylinder. If the enlarged patternwere ruled with these groundinglines, this grounding or ruling could bedone by the same mechanism which produces the pattern; but to so rulethe enlarged pattern makes it difficult for the operator to follow thelines of the pattern with the stylus. Therefore a separate machine isused, by which the oblique lines of the ground are produced.

The invention consists in the peculiar and Serial No. 683,254. (Nomodel.)

novel construction of the grounding attachment by which the longitudinalmovement of the stylus-carriage acts to rotate a bar journaled inbearings on the stylus-frame and provided with a pinion in engagementwith a rack which moves the stylus-frame to partially rotate the roll orcylinder being ongraved, to give to the lines the desired obliquedirection, as will be more fully set forth hereiuafter.

Figure 1 is a top view showing the attachment in connection with thestylus-carriage, the stylus-frame, and the pattern-table of a pantographengraving-machine. Fig. 2 is a view of the rack-bar and the pinionengaged therewith supported on the stylus-frame. Fig. 3 is a side View,on an enlarged scale, of the stylus-carriage, showing the connectionwith the spiral bar. Fig. 4 is a longitudinal sectional view of the stylus-carriage, showing the connections with the spiral bar. Fig. 5 is afront View of a portion of a pantograph engraving machine, showing theattachment in connection with the stylus-carriage, the stylus-frame, andthe pattern-table.

Similar marks of reference indicate corresponding parts in all thefigures.

In the drawings, 0 indicates the table on which the usually-enlargedpattern is supported; b, the stylus-carriage; c, the stylus; d d, thehandles grasped by the operator, by which the movement of thestylus-carriage is controlled, and e e the stylus-frame, which issupported on the ways f, secured to the frame of the machine.

The parts so far described, while they vary in construction in differentpantograph engraving machines, form the essential elements of allmachines of this class. The bar g, having two continuous spiral groovesgg, is journaled in the bearings g 9 secured to the stylus-frame e e atthe opposite ends, and is provided at one end with the pinion 9 which inthe operative position engages with the rack-bar 9 connected with thebrackets g g secured to the ways 1 or any fixed part of the machine. Theends 9 g of the rackbar 9 are provided with two holes, so that therack-bar may be raised and secured in the disconnected position shown inbroken lines in Fig. 2. To the stylus-carriage Z) is secured by suitablescrews the bracket g having the sleeve g inclosing' the spirallygroovedbar g. On the sleeve g is supported, next to the bracket, the adjustablestopplate 9 next to this the operating-handle 9 on which thespring-pressed ratchet-pawl g is pivotally secured. The ratchet-wheel 9is also supported on the sleeve g and held in place by the washer 913,secured to the end of the sleeve g l The bracket 9 is secured to theouter surface of the ratchet- Wheel g and forms the support of the framean upwardly-extending pin ofwhich is secured in the bracket by aclamp-screw. The roller or guide 9 is journaled in the frame Q15 andengages with the groovesin the spirally-grooved bar g. The stop-plate gis provided with a segmental slot and is secured to the bracket 9 by thestop 9 consisting of abolt projecting from the bracket and provided witha nut forming a stop. The stop g is secured in the segmental slot, andthe two stops and are adjusted to give the handle g and the pawl g themovement required to regulate the distance between the lines of thegrounding.

To enable others skilled in the art to use our invention, we will nowmore fully describe the operation of the same. The spirally-grooved bar9 being by its pinion in engagement with the rack secured to a fixedpart of the machine, and the sleeve 9 of the bracket g being secured tothe stylus-carriage b, in the groove 1) of which the post connected withthe lever operating the gravercarriages rests, the stylus as it movesthe stylus-carriage longitudinally on the spirallygrooved bar 9 rotatesthe same by means of the roller or guide g thereby moving thestylus-frame, the spirally-grooved bar journaled in bearings on thestylus-frame, and the stylus-carriage inwardly or outwardly and gives tothe stylus an oblique direction, which is reproduced by the gravers. Theoperator moves the stylus from one edge of the pattern to be grounded tothe other, tracing a line on the pattern, and at the end of each strokethe operator moves the handle 9 from the stop 9" to the stop and backagainst the stop 9" for the next line, and again moving the stylus fromone edge to the other, thereby moving the stylus through a succession ofoblique lines parallel to and at equal distances from each other, whichlines are reproduced by the gravers in the grounding of the pattern andtraced by the stylus on the pattern.

We do not wish to confine ourselves to the exact construction of thepaWl-and-ratchet movement for the spacing of the lines herein described,as the same may be varied or any one of the usual feeding movements usedin similar machines be substituted.

Having thus described our invention, we claim as new and desire tosecure by Letters Patent- 1. In a grounding attachment for pantographengraving-machines, the combination with the stylus-carriage and thestylus-frame, of a spirally-grooved bar journaled in bearings secured tothe stylus-frame, a pinion on the bar, a rack engaging with the pinionand secured to a fixed part of the machine, and an adjustable guideconnected with the styluscarriage and engaging with the spiral of thebar; whereby the longitudinal movement of the stylus-carriage on thespirally-grooved bar operates the stylus-frame, as described.

2. In a pantograph engraving-machine, the

combination with the operative elements of the machine of the followinginstrumentali ties: a rotatable spiral track, a rack and pinion.operated by the rotation of the spiral track, a guide controlled by thestylus-carriage and engaging with the spiral track, and mechanism,substantially as described, intermediate with the guide and thestylus-can riage; whereby a succession of parallel lines may be traced,as described.

3. In a pantograph engraving-machine, the combination with thepattern-table, the stylus-carriage and the stylus-frame, of a racksecured to a fixed part of the machine, a spirally-grooved bar,journal-bearings for the bar secured to the stylus-carriage, a pinion onthe spirally-grooved bar engaging with the rack, a bracket secured tothe stylus-carriage, a sleeve on the bracket inclosing thespirallygrooved bar, aratchet-wheel journaled on the sleeve, a guidesupported on the ratchetwheel and engaging with the spiral groove of thebar, a pawl and handle engaging with the ratchet-wheel, and adjustablestops; whereby oblique parallel lines may be traced on the pattern andengraved on the rolls, as described.

4. In a pantograph engraving-machine, the combination with the table a,the stylus-carriage b, the stylus-frame e and the ways f, of the rack 9ad justably supported on the brackets g g, the bar 9 having the spiraltracks g g, the journal-bearings the pinion 9 on the bar g and engagingwith the rack g the bracket 9 secured to the stylus-carriage, thestop-plate g", the handle g having the pawl g, the ratchet-wheel g, thebracket 9 secured to the ratchet-wheel, the frame 9 adjustably securedin the bracket 9 andthe roller or guide g journaled in the frame gwhereby the longitudinal movement of the stylus-carriage on the barg ischanged to a diagonal direction and parallel lines may be engraved inthe patterns, as described.

In witness whereof we have hereunto set our hands.

JOHN HOPE. JOHN HOPE, JR.

\Vitnesses:

JOSEPH A. MILLER, J12, B. M. SIMMs.

